A local store or library decorated with a mural of some idyllic park scene is almost cliche here in Canada. Typical is a giant yellow sun and, yes, the obligatory detached smiling heads. I've seen abstract geometric patterns more often lately. Often done by schoolchildren, or for some community social event. Sometimes commissioned with actual artists. Bridges and underpasses, particularly pedestrian ones, are also candidates for murals. Quite a few like that in Toronto.